View Poll Results: Are 4-stroke outboards 'there' yet?
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Yes
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4 |
13.33% |
No
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8 |
26.67% |
Nearly
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4 |
13.33% |
2-Stroke 4 eva!
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12 |
40.00% |
An egg-whisk is an eggwhisk is an eggwhisk. Yawn.
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1 |
3.33% |
I'm holding out for hydrogen fuel cells!
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1 |
3.33% |
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26-07-2006, 12:29 PM
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#21
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Registered User
Country: UK
Location: Wiltshire
Occupation: Fool
Boat make: Scorpion RIB
Join Date: Jul 2004
Location: Wiltshire
Posts: 148
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Quote:
Originally posted by TheOrs
This is the very engine that got me thinking about 4-stroke vs 2-stroke.
Mate had a Challenger 2000 with a 2-stroke Merc M-Jet 240HP, then swapped it for a newer, slightly smaller Challenger with the 215HP Rotax 4-stroke. Old boat had more 'Holeshot' but was 10mph slower & used 60 litres of fuel where the new one will use about 40 litres for the same time out and max out at nearly 60mph. I have to admit I was suprised at how good it was.
I
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Yep, It's a cracking unit. My mate has just had a Riva Racing kit delivered from the States for his. Apparently the HP increases to nearly 300. Now that should be interesting
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Make Poetry History
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26-07-2006, 01:23 PM
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#22
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Registered User
Country: UK
Location: Coventry (but from Lee on Solent)
Occupation: Sales Director
Interests: My Boat of course
Boat make: Extreme 21
Engines: Merc V8
Cruising area: Solent
Join Date: Jul 2005
Location: Coventry (but from Lee on Solent)
Posts: 587
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My concern with 4 strokes is weight and size. They look huge compared to 2 strokes with equal horse power.
Does this mean that for people such as myself who have an older boat (ring 18) which has a maximum hp rating of 200HP (which is what we are running with at the mo), we would be unable to fit a 4 stroke equivalent due to size / weight.
If this is the case and we wanted to fit a 4 stroke, then what would be the max HP that could be fitted to a Ring / Phantom / Marshan 18 / 19 and of course 21??
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The Docta
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26-07-2006, 02:10 PM
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#23
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Registered User
Country: UK
Location: Thorpe Bay
Occupation: IT Director, www.lighthouseit.co.uk
Interests: Boats, Surfing & Snowboarding
Boat name: Isabella / Cool Runnings II / Bella / Sea Pup / Sea Dog / Speedy II / Bernico F3
Boat make: Colvic 35 Suncruiser / Bernico F3 / Phantom 16 / Zodiac 420 YL / RIB / Apollo 9
Engines: 2 x Perkins Sabre 225ti / Mercury Pro XS /Mercury Pro XS 115/ Tohatsu 2.5 / Mercury 25 / Mercury 50
Cruising area: Thames Estuary / River Crouch / Salcombe
Join Date: Jun 2004
Location: Thorpe Bay
Posts: 932
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40Lb differenace between yamaha vmax 2 stoke and a four stroke 200HP. Is that a lot?
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Loving the Spitfire with a 25HP Mercury
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26-07-2006, 02:33 PM
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#24
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Traveling
Country: UK
Location: Alderholt
Occupation: Aerospace
Boat name: T/T D2S
Boat make: Midas 27' Cat, Argo 16 Cat. Avon Rib Thingy
Engines: Merc 280-ROS -JSRE,65Xs, 75 Stinger, Yam 60
Cruising area: Any Seedy Bar
Join Date: Sep 2004
Location: Alderholt
Posts: 4,225
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300XS Stroker 505lbs (longshaft)
275 Varado 667 lbs (Standard)
2.5's circa 450 lbs
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At least 75% of people who read this will try to lick their elbow!
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26-07-2006, 02:38 PM
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#25
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Registered User
Country: UK
Location: Thorpe Bay
Occupation: IT Director, www.lighthouseit.co.uk
Interests: Boats, Surfing & Snowboarding
Boat name: Isabella / Cool Runnings II / Bella / Sea Pup / Sea Dog / Speedy II / Bernico F3
Boat make: Colvic 35 Suncruiser / Bernico F3 / Phantom 16 / Zodiac 420 YL / RIB / Apollo 9
Engines: 2 x Perkins Sabre 225ti / Mercury Pro XS /Mercury Pro XS 115/ Tohatsu 2.5 / Mercury 25 / Mercury 50
Cruising area: Thames Estuary / River Crouch / Salcombe
Join Date: Jun 2004
Location: Thorpe Bay
Posts: 932
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Quote:
Originally posted by BluFin
300XS Stroker 505lbs (longshaft)
275 Varado 667 lbs (Standard)
2.5's circa 450 lbs
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Granted the Varado is excessive, but you can see that in its size.
__________________
Loving the Spitfire with a 25HP Mercury
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29-07-2006, 02:53 PM
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#26
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Registered User
Country: England
Location: Plymouth
Boat make: Fletcher Arrowflyte
Engines: Mercury 75
Join Date: Nov 2004
Location: Plymouth
Posts: 402
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Quote:
Originally posted by Matt
Torque is the problem. Jets can be designed to rev to the sky and don't need much torque to get them spinning, "slip" is incredibly high on a jet. The same motor coupled to a prop on a rib full of divers would struggle.
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Yes; what you say ties in with the driving experience. The 4-stroke jet is a little slower out of the hole but I guess it gets the top end advantage 'cause at Vmax it's revving to about 8K.
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30-07-2006, 05:35 AM
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#27
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Ex Member (& official dickhead)
Country: England
Location: Nth Lincolnshire
Occupation: Roofing contractor
Interests: Gas turbine powered,Model hydroplane's played the drums for to long, Merc outboards
Boat name: Moisty
Engines: 280 efi / Xr2 P head
Cruising area: Skeggy,Donnor nook,Conniston water,Mablethorpe
Join Date: Jul 2006
Location: Nth Lincolnshire
Posts: 42
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2 stroker's are King
YES!.....Still has to be a 2 stroker for me two,even though the old Xr2's are a load of old crap,'god bless'em, No afence.. (Been there and got the t shirt!)
The opimax 2 stroke XS's have sorted the feull brobs out,even being more economical than some big 4stroker's.
But I still love the sound of the xr2, when I, just like ya self was'nt fixing it. I must have been band off every jet ski lake in the east riding for the noise it made. HA!
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whooooosh!!
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